1911 10mm to 40S&W conversion: New 40S&W barrel for my Colt Delta Elite 10mm

By remat457-Reg-Mathusz

I get asked this a lot.

Yes, you can add a 40 barrel to your 10mm pistol and it is pretty easy.
Here are some pics of what I did to add one to my Colt Delta Elite.

First, find a barrel. This is pretty easy depending on your pistol. Here are a couple of sources:
1911 5″ – Numrich (Kahr)
1911 4.25″ – Brownells (Storm Lake)
Glock – Lone Wolf Dist.
Tanfoglio – EAA

I bought one from Numrich for about $80. It is a very nice 416 stainless barrel. The crown is actually nicer than the stock barrel:

A 1911 is old school (i.e. not modular) so it requiries fitting. It should be minimal and any gunsmith will be able to do it. Other platforms probably will not.

I was going to buy the Wilson video, watch it and fit it myself. However, I sat on the barrel for about 3 months before I decided to just take it to my local smith and have it fit. It took him a few days and cost me less than $50.

Here is what it looks like:

What about mags and springs?
Good questions.

I put it in a 20# Wolff with a standard guide plug that I already had.
I also used the stock 10mm magazines and it has worked perfectly with several brands of ammunition.

If I was to rely on it for self-defense –not sure why I would underload a 10mm–but I would get a couple of 40S&W 1911 magazines with the spacers. The OAL differences of the two cartridges is pretty great so I would be worried about potential feeding problems. Since this is just to use cheap(er) range ammo, it is not an issue for me.

Pretty neat setup for minimal cost.

Comments: 5

  1. post says:

    Nice post. Very useful information specially the last phase :) I take care of such info a lot. I was looking for this certain information for a long time. Thanks and best of luck.

  2. remat457 says:

    I am going to order 18 and 16 # Wolf springs and see how they work also. Dan Wesson put 16# in their PM.

  3. reg says:

    Thanks! I am looking forward to running its paces with the MetalForm mags to see how it does with hollow point ammo.

  4. Marren says:

    Thanks very much for writing a lot of this excellent information! I am looking forward to reading more!

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